When I was thinking of doing this I know I found some just googling antique map and then whatever the place was and then I had planned to just print it off and cut it down to size and use double sided tape to tape it down...but if you weren't looking for a DIY task I know www.magnetstreet.com has some for a good price i don't think they have any map ones but they definitely have a bunch of others for a good price. Good luck!